Forex glossary

One Cancels Other (OCO) in Forex

A clear definition of One Cancels Other (OCO), with practical context for reading markets and making better trading decisions.

Level 2 · From Prices to PracticeOrders & execution

Definition

A One Cancels Other (OCO) instruction links two orders so that when one is executed, the other is automatically cancelled. It is used to manage mutually exclusive outcomes without leaving both orders active after one condition is met.

How It Works

Orders are instructions, and their exact behavior depends on the conditions attached to them: price, quantity, timing, and what should happen if execution is only partly available. Before confirming an order, read the order type and validity fields rather than assuming every instruction behaves like a market order.

Why It Matters

This matters because two orders aimed at the same market can produce very different outcomes. Level 2 treats order mechanics as a safety skill: configure the instruction you actually intend, then review it before submission.

Key Takeaway

A One Cancels Other (OCO) instruction links two orders so that when one is executed, the other is automatically cancelled.

Practical forex example

A trader has a position with a take-profit order above the market and a stop order below it. If the take-profit executes first, the linked stop is cancelled automatically.

Why One Cancels Other (OCO) matters

Understanding One Cancels Other (OCO) helps traders interpret market information, plan decisions, and manage risk with more context.

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